Communication Signal Transmission Method, Device and System

ABSTRACT

A method, device, and system for communication signal transmission are provided, which relate to the field of communications, so as to improve reception performance of the network. The method includes dividing, by a multi-frequency receiver, Radio Frequency (RF) signals by frequency bands received from an antenna to obtain RF signals of different frequency bands; sending a first group of RF signals of a predetermined frequency band to an RF unit so that the RF unit converts the received first group of the RF signals of the predetermined frequency band into first baseband digital signals and sends the first baseband digital signals to a baseband processing unit; and converting a second group of the RF signals of the predetermined frequency band into second baseband digital signals and sending the second baseband digital signals to the baseband processing unit by using a digital baseband interface

This application is a continuation of International Application No.PCT/CN2011/070347, filed on Jan. 18, 2011, which claims priority toChinese Patent Application No. 201010586186.5, filed on Dec. 13, 2010,both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present invention relates to the field of communications, and inparticular embodiments, to a communication signal transmission method,device, and system.

BACKGROUND

With the increasing application of new wireless standard technologies,such as Wideband Code Division Multiple Access (WCDMA) and Long TermEvolution (LTE), the number of scenarios in which newly added frequencybands and multiple frequencies share a station increases. Meanwhile,with the development of antenna technologies, frequency bands supportedby antennas also expand continuously, and currently, a broadband antennaalready can support 790 MHz to 960 MHz or 1710 MHz to 2690 MHz. Takinghigh-frequency bands for example, a dual-polarized antenna of 1710 MHzto 2690 MHz can support transceivers of 1800 MHz, 2100 MHz, 2100 MHz, ormore different frequency bands share an antenna at the same time. Withincreasing requirements on capacity, an operator has to make good use offrequency resources. In addition, station resources are more and moredifficult to acquire, and therefore, scenarios in which operators ofmultiple frequencies share stations will become more and more common inthe future. How to make good use of broadband characteristics of theantenna, that is, each antenna can receive signals of multiplefrequencies, and the signals are well used to easily upgrade theexisting x way Transmitter and 2 way Receiver (xT2R) (where, x=0, 1, . .. ) network to an xT4R network, or even an xT6R or xT8R network, hasbecome a focus of R&D personnel.

In a relevant technical solution in the prior art, as shown in FIG. 1,four single-frequency xT2R modules and two antennas are used to form adual-frequency 4 way Receiver (4R) module, in which a Tower MountedAmplifier (TMA) is optional. In order to support dual-frequency 4R, fourRadio Frequency (RF) transceiver modules are required, and two antennasare required because 4R of a signal antenna cannot be used in amultiplex manner, thereby resulting in high costs and complexconfiguration. Signals of multiple frequency bands cannot be extractedfrom an antenna.

In another technical solution in the prior art, as shown in FIG. 2, foursingle-frequency xT2R modules are used to form a dual-frequency xT4Rmodule, and four combiner (Com) units are further included, in which aTMA is optional. In order to support dual-frequency 4R, four modules andfour Com units are required. In the solution, although the number of theantennas to be used is decreased, four extra external Com units arerequired, thereby resulting in complex implementation and configurationof the solution

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a method, device, andsystem for communication signal transmission, so as to improve receptionperformance of the network.

To achieve the above purpose, the embodiments of the present inventionadopt the following technical solutions.

An embodiment of the present invention provides a communication signaltransmission method. The method includes receiving, by a multi-frequencyreceiver, RF signals from an antenna, and dividing the RF signals intoRF signals of different frequency bands by frequency bands. A firstgroup of RF signals of a predetermined frequency band is sent to an RFunit, so that the RF unit converts the received RF signals into firstbaseband digital signals and sends the first baseband digital signals toa baseband processing unit. A second group of the RF signals of thepredetermined frequency band is converted into second baseband digitalsignals, and sending the second baseband digital signals to the basebandprocessing unit.

An embodiment of the present invention provides a communication signaltransmission method. The method includes receiving, by a basebandprocessing unit, second baseband digital signals of a predeterminedfrequency band sent by a multi-frequency receiver and first basebanddigital signals of the predetermined frequency band sent by an RF unit.Baseband processing is performed on the first baseband digital signalsand the second baseband digital signals.

An embodiment of the present invention provides a communication signaltransmission method. The method includes receiving, by a multi-frequencyreceiver, RF signals from an antenna, and dividing the RF signals intoRF signals of different frequency bands by frequency bands. A firstgroup of RF signals of a predetermined frequency band is sent to an RFunit, so that the RF unit converts the received RF signals into firstbaseband digital signals and sends the first baseband digital signals toa baseband processing unit. A second group of the RF signals of thepredetermined frequency band is converted into second baseband digitalsignals. The second baseband digital signals are sent to the RF unit, sothat the RF unit sends the second baseband digital signals to thebaseband processing unit.

An embodiment of the present invention provides a multi-frequencyreceiver. The multi-frequency receiver includes a multi-frequencycombiner/divider and multiple receivers, one or more digital basebandinterfaces, one or more first RF interfaces connected to an antenna, andone or more second RF interfaces connected to an RF unit, where eachfrequency band corresponds to multiple receivers. The multi-frequencycombiner/divider is configured to distribute RF signals received by theantenna to receivers by frequency bands. A first group of the receiversof a predetermined frequency band are configured to send RF signalsreceived by such receivers to the RF unit by using a second RFinterface, so that the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to a baseband processing unit. A second group of the receiversof the predetermined frequency band are configured to convert RF signalsreceived by such receivers into the second baseband digital signals, andsend the second baseband digital signals to the baseband processing unitby using a digital baseband interface.

An embodiment of the present invention provides a multi-frequencyreceiver. The multi-frequency receiver includes a multi-frequencycombiner/divider and multiple receivers, one or more digital basebandinterfaces, one or more first RF interfaces connected to an antenna, andone or more second RF interfaces connected to an RF unit, where eachfrequency band corresponds to multiple receivers. The multi-frequencycombiner/divider is configured to distribute RF signals received by theantenna to receivers by frequency bands. A first group of the receiversof the predetermined frequency band are configured to send RF signalsreceived by such receivers to the RF unit by using a second RFinterface, so that the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to a baseband processing unit. A second group of the receiversof the predetermined frequency band are configured to convert RF signalsreceived by such receivers into the second baseband digital signals, andsend the second baseband digital signals to the RF unit by using adigital baseband interface, so that the RF unit sends the secondbaseband digital signals to the baseband processing unit.

An embodiment of the present invention provides a wireless communicationsystem. The wireless communication system includes a multi-frequencyreceiver. The multi-frequency receiver includes one or more digitalbaseband interfaces, one or more first RF interfaces connected to anantenna, and one or more second RF interfaces connected to an RF unit.The multi-frequency receiver is configured to divide RF signals byfrequency bands received by using a first RF interface from the antennato obtain RF signals of different frequency bands; to send a first groupof RF signals of a predetermined frequency band to the RF unit by usinga first RF interface so that the RF unit converts the received firstgroup of the RF signals of the predetermined frequency band into firstbaseband digital signals and sends the first baseband digital signals toa baseband processing unit; and to convert the second group of the RFsignals of the predetermined frequency band into second baseband digitalsignals and send the second baseband digital signals to the basebandprocessing unit by using a digital baseband interface.

An embodiment of the present invention provides a wireless communicationsystem. The wireless communication system includes a multi-frequencyreceiver. The multi-frequency receiver includes one or more digitalbaseband interfaces, one or more first RF interfaces connected to anantenna, and one or more second RF interfaces connected to an RF unit.The multi-frequency receiver is configured to divide RF signals byfrequency bands received by using a first RF interface from the antennato obtain RF signals of different frequency bands; to send a first groupof RF signals of a predetermined frequency band to the RF unit by usinga second RF interface so that the RF unit converts the received firstgroup of the RF signals of the predetermined frequency band into firstbaseband digital signals and sends the first baseband digital signals toa baseband processing unit; and to convert a second group of the RFsignals of the predetermined frequency band into second baseband digitalsignals and send the second baseband digital signals to a first RFmodule by using a digital baseband interface, so that the first RFmodule sends the second baseband digital signals to the basebandprocessing unit.

In the technical solutions according to the embodiments of the presentinvention, a multi-frequency receiver divides RF signals by frequencybands received from an antenna to obtain RF signals of differentfrequency bands; sends a first group of RF signals of a predeterminedfrequency band to an RF unit so that the RF unit converts the receivedfirst group of the RF signals of the predetermined frequency band intofirst baseband digital signals and sends the first baseband digitalsignals to a baseband processing unit; and converts a second group ofthe RF signals of the predetermined frequency band into second basebanddigital signals and sends the second baseband digital signals to thebaseband processing unit by using a digital baseband interface.

Alternatively, the multi-frequency receiver sends the first group of theRF signals of the predetermined frequency band to the RF unit, so thatthe RF unit converts the received first group of the RF signals of thepredetermined frequency band into the first baseband digital signals andsends the first baseband digital signals to a baseband processing unit;and converts the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals and sends thesecond baseband digital signals to a first RF module by using a digitalbaseband interface, so that the first RF module sends the secondbaseband digital signals to the baseband processing unit. In this way,the baseband processing unit can receive multiple channels of receivedsignals corresponding to the different frequency bands, and the numberof the channels in which a network system receives the RF signals of thedifferent frequency bands is increased, thereby improving receptionperformance of the network system without adding any antenna.

In addition, in the technical solutions according to the embodiments ofthe present invention, the baseband digital signals corresponding to thesecond group of the RF signals of the predetermined frequency band aresent to the baseband processing unit only by using a digital basebandinterface of the multi-frequency receiver, so that multi-reception isachieved in a simple manner.

BRIEF DESCRIPTION OF THE DRAWINGS

To illustrate the technical solutions according to the embodiments ofthe present invention or in the prior art more clearly, the accompanyingdrawings required for describing the embodiments or the prior art areintroduced below briefly. Apparently, the accompanying drawings in thefollowing descriptions merely show some of the embodiments of thepresent invention, and persons of ordinary skill in the art can obtainother drawings according to the accompanying drawings without creativeefforts.

FIG. 1 is a schematic block diagram of a technical solution in the priorart;

FIG. 2 is a schematic block diagram of another technical solution in theprior art;

FIG. 3 is a flow chart of a communication signal transmission method ofa multi-frequency receiver side according to Embodiment 1 of the presentinvention;

FIG. 4 is a schematic flow chart of the multi-frequency receiverreceiving RF signals according to Embodiment 1 of the present invention;

FIG. 5 is a flow chart of a communication signal transmission method ofa baseband processing unit side according to Embodiment 1 of the presentinvention;

FIG. 6 is a flow chart of a communication signal transmission method ofa multi-frequency receiver side according to Embodiment 2 of the presentinvention;

FIG. 7 is a flow chart of a communication signal transmission method ofa baseband processing unit side according to Embodiment 2 of the presentinvention;

FIG. 8 is a schematic block diagram of a multi-frequency receiveraccording to Embodiment 3 of the present invention;

FIG. 9 is a schematic block diagram of a multi-frequency receiveraccording to Embodiment 4 of the present invention;

FIG. 10 is a schematic block diagram of a wireless communication systemaccording to Embodiment 5 of the present invention;

FIG. 11 is a schematic block diagram of another wireless communicationsystem according to Embodiment 5 of the present invention;

FIG. 12 is a schematic block diagram of another wireless communicationsystem according to Embodiment 5 of the present invention;

FIG. 13 is a schematic block diagram of another wireless communicationsystem according to Embodiment 5 of the present invention;

FIG. 14 is a schematic block diagram of another wireless communicationsystem according to Embodiment 5 of the present invention;

FIG. 15 is a schematic block diagram of a wireless communication systemaccording to Embodiment 6 of the present invention;

FIG. 16 is a schematic block diagram of another wireless communicationsystem according to Embodiment 6 of the present invention;

FIG. 17 is a schematic block diagram of another wireless communicationsystem according to Embodiment 6 of the present invention;

FIG. 18 is a schematic block diagram of another wireless communicationsystem according to Embodiment 6 of the present invention;

FIG. 19 is a schematic block diagram of another wireless communicationsystem according to Embodiment 6 of the present invention; and

FIG. 20 is another schematic flow chart of the multi-frequency receiverreceiving RF signals according to Embodiment 1 of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

The technical solution of the present invention is clearly andcompletely described in the following with reference to the accompanyingdrawings. It is obvious that the embodiments to be described are only apart rather than all of the embodiments of the present invention. Personhaving ordinary skill in the art can derive other embodiments from theembodiments provided herein without making any creative effort, and allsuch embodiments are covered in the protection scope of the presentinvention.

It should be noted that, each of the embodiments of the presentinvention is applicable to a Frequency Division Duplexing (FDD) system,a Time Division Duplexing (TDD) system, and other systems, such as ahybrid FDD-TDD system.

Embodiment 1

According to a first embodiment of the present invention, acommunication signal transmission method is provided. The method is amethod of a multi-frequency receiver side. As shown in FIG. 3, themethod includes the following steps.

Step 101: A multi-frequency receiver receives RF signals from anantenna, and divides the RF signals into RF signals of differentfrequency bands by frequency bands.

Specifically, the receiving, by the multi-frequency receiver, the RFsignals from the antenna, and dividing the RF signals into the RFsignals of the different frequency bands includes the following step. Asshown in FIG. 4, when the RF signals received by the multi-frequencyreceiver from the antenna include the RF signals of three frequencybands, the RF signals are divided into the RF signals of the threefrequency bands by frequency bands, which are RF signals of an F1frequency band, RF signals of an F2 frequency band, and RF signals of anF3 frequency band. In addition, each of the frequency bands correspondsto multiple reception channels for receiving the RF signals of thefrequency band. For example, the RF signals of the F1 frequency band arereceived by four reception channels, which are four F1Rs shown in FIG.4; the RF signals of the F2 frequency band are received by fourreception channels, which are four F2Rs shown in FIG. 4 and the RFsignals of the F3 frequency band are received by four reception channel,which are four F31Rs shown in FIG. 4.

Step 102: The multi-frequency receiver sends a first group of RF signalsof a predetermined frequency band to an RF unit so that the RF unitconverts the received RF signals into first baseband digital signals andsends the first baseband digital signals to a baseband processing unit;and converts a second group of the RF signals of the predeterminedfrequency band into second baseband digital signals and sends the secondbaseband digital signals to the baseband processing unit.

The sending the first group of the RF signals of the predeterminedfrequency band to the RF unit so that the RF unit converts the receivedRF signals into the first baseband digital signals and sends the firstbaseband digital signals to the baseband processing unit includes:sending a group of the RF signals of a first frequency band to a firstRF module, so that the first RF module converts the received RF signalsinto the first baseband digital signals and sends the first basebanddigital signals to the baseband processing unit.

It should be noted that, the first frequency band herein generallyrefers to any frequency band included by the multi-frequency receiver,and is not limited to the frequency band numbered 1, of the frequencybands. For example, as shown in FIG. 4, the first frequency band ispreset as the F1 frequency band, and the sending a group of the RFsignals of the first frequency band to the first RF module so that thefirst RF module converts the received RF signals into the first basebanddigital signals and sends the first baseband digital signals to thebaseband processing unit may include: sending RF signals received by tworeception channels (a reception channel {circle around (1)} and areception channel {circle around (2)}) of the F1 frequency band to thefirst RF module, so that the first RF module converts the received twoRF signals into respective first baseband digital signals of the two RFsignals and sends the first baseband digital signals to the basebandprocessing unit.

The converting the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals and sending thesecond baseband digital signals to the baseband processing unit includesconverting remaining RF signals of the first frequency band into thesecond baseband digital signals, and sending the second baseband digitalsignals to the baseband processing unit.

For example, as shown in FIG. 4, the converting the remaining RF signalsof the F1 frequency band into the second baseband digital signals andsending the second baseband digital signals to the baseband processingunit may include: converting RF signals received by two remainingreception channels (a reception channel {circle around (3)} and areception channel {circle around (4)}) of the F1 frequency band intorespective second baseband digital signals of the two channels, andsending the second baseband digital signals to the baseband processingunit by using a digital baseband interface. PWR shown in FIG. 4represents a power interface.

It should be understood that, FIG. 4 is a schematic flow chart of amulti-frequency receiver in an FDD system receiving RF signals; and FIG.20 illustrates the flow of a multi-frequency receiver in a TDD systemreceiving RF signals. The difference between FIG. 20 and FIG. 4 is that:in FIG. 4, a reception channel and a transmission channel of the samefrequency band in a receiver correspond to different physical channels,but in FIG. 20, a reception channel and a transmission channel of thesame frequency band in a receiver correspond to the same physicalchannel.

According to the embodiment of the present invention, a communicationsignal transmission method is further provided, and the method is amethod of a baseband processing unit side. As shown in FIG. 5, themethod includes the following steps.

Step 201: A baseband processing unit receives second baseband digitalsignals of a predetermined frequency band sent by a multi-frequencyreceiver and first baseband digital signals of the predeterminedfrequency band sent by an RF unit.

The second baseband digital signals are obtained by converting a secondgroup of the RF signals of the predetermined frequency band received bythe multi-frequency receiver; and the first baseband digital signals areobtained by converting, by the RF unit, a first group of the RF signalsof the predetermined frequency band received by the multi-frequencyreceiver.

For example, corresponding to what is illustrated in FIG. 4, the F1frequency band is still taken as an example for illustrating. In theembodiment of the present invention, the second baseband digital signalsare obtained by converting the RF signals received by the receptionchannel {circle around (3)} and the reception channel {circle around(4)} among the RF signals of the F1 frequency band received by themulti-frequency receiver, and two-channel reception is implemented. Thefirst baseband digital signals are obtained by converting, by the RFunit, the RF signals received by the reception channel {circle around(1)} and the reception channel {circle around (2)} among the RF signalsof the F1 frequency band received by the multi-frequency receiver, andtwo-channel reception is also implemented. Therefore, when the basebandprocessing unit receives the first baseband digital signals and thesecond baseband digital signals, four-channel reception on one frequencybands is implemented.

It should be noted that, when the multi-frequency receiver performs thepreceding operation respectively on the received RF signals of multiplefrequency bands, the baseband processing unit accordingly performsmulti-channel reception on all of the multiple frequency bands.

Step 202: Baseband processing is performed on the first baseband digitalsignals and the second baseband digital signals.

The performing of the baseband processing on the first baseband digitalsignals and the second baseband digital signals may be implemented byusing any method in the prior art, and is not limited by the embodimentof the present invention.

In the embodiment of the present invention, the multi-frequency receiverdivides the RF signals by frequency bands received from an antenna toobtain the RF signals of the different frequency bands; sends the firstgroup of the RF signals of the predetermined frequency band to the RFunit so that the RF unit converts the received first group of the RFsignals of the predetermined frequency band into the first basebanddigital signals and sends the first baseband digital signals to thebaseband processing unit; and converts the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and sends the second baseband digital signals to thebaseband processing unit. In this way, the baseband processing unit canreceive multiple channels of received signals corresponding to thedifferent frequency bands, and the number of the channels in which thenetwork system receives the RF signals corresponding to the differentfrequency bands is increased without adding any antenna, therebyimproving reception performance of the network system. In addition, inthe technical solution according to the embodiment of the presentinvention, the baseband digital signals corresponding to the secondgroup of the RF signals of the predetermined frequency band are sent tothe baseband processing unit only by using a digital baseband interfaceof the multi-frequency receiver, so that multi-reception is achieved ina simple manner.

The communication signal transmission method is described in detail withreference to FIG. 4 in the preceding embodiment. Obviously, the methodis also applicable to FIG. 20, and specific processing proceduresthereof are substantially the same as those in FIG. 4, which are notrepeated herein.

Embodiment 2

According to the embodiment of the present invention, a communicationsignal transmission method is provided, and the method is a method of amulti-frequency receiver side. As shown in FIG. 6, the method includesthe following steps.

Step 301: A multi-frequency receiver receives RF signals from anantenna, and divides the RF signals into RF signals of differentfrequency bands by frequency bands.

In the embodiment of the present invention, corresponding descriptionsin step 101 in Embodiment 1 may be referred to for detailed descriptionsof the receiving, by the multi-frequency receiver, the RF signals fromthe antenna and dividing the RF signals into the RF signals of thedifferent frequency bands. Therefore, the descriptions are not repeatedherein in the embodiment of the present invention.

Step 302: The multi-frequency receiver sends a first group of RF signalsof a predetermined frequency band to an RF unit so that the RF unitconverts the received RF signals into first baseband digital signals andsends the first baseband digital signals to a baseband processing unit;and converts a second group of the RF signals of the predeterminedfrequency band into second baseband digital signals and sends the secondbaseband digital signals to the RF unit so that the RF unit sends thesecond baseband digital signals to the baseband processing unit.

The sending the first group of the RF signals of the predeterminedfrequency band to the RF unit so that the RF unit converts the receivedRF signals into the first baseband digital signals and sends the firstbaseband digital signals to the baseband processing unit includes:sending a group of the RF signals of a first frequency band to a firstRF module, so that the first RF module converts the received RF signalsinto the first baseband digital signals and sends the first basebanddigital signals to the baseband processing unit. Correspondingdescriptions in step 102 in Embodiment 1 may be referred to for detaileddescriptions of the sending the first group of the RF signals of thepredetermined frequency band to the RF unit. Therefore, the descriptionsare not repeated herein in the embodiment of the present invention.

The converting the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals and sending thesecond baseband digital signals to the RF unit so that the RF unit sendsthe second baseband digital signals to the baseband processing unitincludes converting remaining RF signals of the first frequency bandinto the second baseband digital signals and sending the second basebanddigital signals to the first RF module, so that the first RF modulesends the second baseband digital signals to the baseband processingunit. Corresponding descriptions in step 102 in Embodiment 1 may bereferred to for detailed descriptions of the converting the second groupof the RF signals of the predetermined frequency band into the secondbaseband digital signals and sending the second baseband digital signalsto the RF unit so that the RF unit sends the second baseband digitalsignals to the baseband processing unit. What is different is that, thesecond baseband digital signals are sent to the RF unit, and the RF unitforwards the second baseband digital signals to the baseband processingunit.

According to the embodiment of the present invention, a communicationsignal transmission method is further provided, and the method is amethod of a baseband processing unit side. As shown in FIG. 7, themethod includes the following steps:

Step 401: A baseband processing unit receives first baseband digitalsignals of a predetermined frequency band and second baseband digitalsignals of the predetermined frequency band sent by an RF unit.

The second baseband digital signals are obtained by converting a secondgroup of RF signals of the predetermined frequency band received by themulti-frequency receiver, and the multi-frequency receiver sends thesecond baseband digital signals to the RF unit, so that the RF unitsends the second baseband digital signals to the baseband processingunit. The first baseband digital signals are obtained by converting, bythe RF unit, a first group of the RF signals of the predeterminedfrequency band received by the multi-frequency receiver.

Step 402: Baseband processing is performed on the first baseband digitalsignals and the second baseband digital signal.

The performing the baseband processing on the first baseband digitalsignals and the second baseband digital signals may be implemented byusing any method in the prior art, and is not limited by the embodimentof the present invention.

In the embodiment of the present invention, the multi-frequency receiverdivides RF signals by frequency bands received from an antenna to obtainthe RF signals of different frequency bands; sends the first group ofthe RF signals of the predetermined frequency band to the RF unit sothat the RF unit converts the received first group of the RF signals ofthe predetermined frequency band into the first baseband digital signalsand sends the first baseband digital signals to the baseband processingunit; and converts the second group of the RF signals of thepredetermined frequency band into the second baseband digital signalsand sends the second baseband digital signals to the RF unit, to enablethe RF unit to forward the second baseband digital signals to thebaseband processing unit. In this way, the baseband processing unit canreceive multiple channels of received signals corresponding to thedifferent frequency bands, and the number of the channels in which thenetwork system receives the RF signals corresponding to the differentfrequency bands is increased without adding any antenna, therebyimproving reception performance of the network system. In addition, inthe technical solution according to the embodiment of the presentinvention, the baseband digital signals corresponding to the secondgroup of the RF signals of the predetermined frequency band are sent tothe baseband processing unit only by using a digital baseband interfaceof the multi-frequency receiver, so that multi-reception is achieved ina simple manner.

Embodiment 3

According to the embodiment of the present invention, a multi-frequencyreceiver is provided. As shown in FIG. 8, the multi-frequency receiverincludes a multi-frequency combiner/divider 51 and multiple receivers52. Each frequency band corresponds to multiple receivers 52, one ormore digital baseband interfaces, one or more first RF interfacesconnected to an antenna, and one or more second RF interfaces connectedto an RF unit.

The multi-frequency combiner/divider 51 is configured to distribute RFsignals received by the antenna to receivers 52 of a predeterminedfrequency band by frequency bands.

A first group of the receivers 52 of the predetermined frequency bandare configured to send RF signals received by such receivers to the RFunit by using a second RF interface, so that the RF unit converts thereceived RF signals into first baseband digital signals and sends thefirst baseband digital signals to a baseband processing unit. A secondgroup of the receivers 52 of the predetermined frequency band areconfigured to convert RF signals received by such receivers into secondbaseband digital signals, and send the second baseband digital signalsto the baseband processing unit by using a digital baseband interface.

When the predetermined frequency band includes a first frequency bandand the RF unit includes a first RF module, the first group of thereceivers 52 of the predetermined frequency band are configured to sendRF signals received by such receivers to the first RF module by using asecond RF interface, so that the first RF unit converts the received RFsignals into the first baseband digital signals and sends the firstbaseband digital signals to the baseband processing unit. The secondgroup of the receivers 52 of the predetermined frequency band areconfigured to convert RF signals received by such receivers into thesecond baseband digital signals, and send the second baseband digitalsignals to the baseband processing unit by using a digital basebandinterface. When the first frequency band includes F1, details are asfollows.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and two of the receivers are used as a group of thereceivers of the first frequency band. The group of receivers of thefirst frequency band F1 are configured to send RF signals received bysuch receivers to the first RF module by using a second RF interface, sothat the first RF module converts the received RF signals into the firstbaseband digital signals and sends the first baseband digital signals tothe baseband processing unit. Corresponding descriptions in step 102 inEmbodiment 1 may be referred to for details about how the group of thereceivers of the first frequency band F1 to send the received RF signalsto the first RF module by using a second RF interface. Therefore, thedetails are not repeated herein in the embodiment of the presentinvention.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and the other two of the receivers are used as theremaining receivers of the first frequency band F1. The remainingreceivers of the first frequency band F1 are configured to convert RFsignals received by such receivers into the second baseband digitalsignals, and send the second baseband digital signals to the basebandprocessing unit by using a digital baseband interface. Correspondingdescriptions in step 102 in Embodiment 1 may be referred to for detailsabout how the remaining receivers of the first frequency band F1 toconvert the received RF signals into the second baseband digital signalsand send the second baseband digital signals to the baseband processingunit by using a digital baseband interface. Therefore, the details arenot repeated herein in the embodiment of the present invention.

When the predetermined frequency band includes a first frequency bandand a second frequency band, and the RF unit includes a first RF moduleand a second RF module, the first group of the receivers 52 of thepredetermined frequency band are configured to send RF signals receivedby such receivers to the corresponding RF modules by using the second RFinterfaces, so that the corresponding RF modules convert the received RFsignals into the first baseband digital signals, and send the firstbaseband digital signals to the baseband processing unit. The secondgroup of the receivers 52 of the predetermined frequency band areconfigured to convert RF signals received by such receivers into thesecond baseband digital signals, and send the second baseband digitalsignals to the baseband processing unit by using a digital basebandinterface. Details of the respective RF modules of the received RFsignals include.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and two of the receivers are used as a group of thereceivers of the first frequency band F1; and the number of thereceivers corresponding to the second frequency band F2 is 4, and two ofthe receivers are used as a group of the receivers of the secondfrequency band F2. The group of the receivers of the first frequencyband F1 and the group of receivers of the second frequency band F2 areconfigured to send the respective received RF signals to the respectiveRF modules by using the respective second RF interfaces, so that the RFmodules convert the received RF signals into the first baseband digitalsignals, and send the first baseband digital signals to the basebandprocessing unit. Corresponding descriptions in step 102 in Embodiment 1may be referred to for details about a group of the receivers of thefirst frequency band F1 and a group of the receivers of the secondfrequency band F2 to send the respective received RF signals to therespective RF modules by using the respective second RF interfaces.Therefore, the details are not repeated herein in the embodiment of thepresent invention.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and the other two of the receivers are used as theremaining receivers of the first frequency band F1; and there are fourreceivers corresponding to the second frequency band F2, and the othertwo of the receivers are used as the remaining receivers of the secondfrequency band F2. The remaining receivers of the first frequency bandF1 and remaining receivers of the second frequency band F2 areconfigured to convert the respective received RF signals into the secondbaseband digital signals, and send the second baseband digital signalsto the baseband processing unit by using a digital baseband interface.

When the predetermined frequency band includes a first frequency band, asecond frequency band, and a third frequency band, and the RF unitincludes a first RF module, a second RF module, and a third RF module,the first group of the receivers 52 of the predetermined frequency bandare configured to send RF signals received by such receivers to the RFunit by using a second RF interface, so that the RF unit converts thereceived RF signals into the first baseband digital signals, and sendsthe first baseband digital signals to the baseband processing unit. Thesecond group of the receivers 52 of the predetermined frequency band areconfigured to convert RF signals received by such receivers into thesecond baseband digital signals, and send the second baseband digitalsignals to the baseband processing unit by using a digital basebandinterface. When the first frequency band includes F1, the secondfrequency band includes F2, and the third frequency band includes F3,details are as follows:

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and two of the receivers are used as a group of thereceivers of the first frequency band F1; and there are four receiverscorresponding to the second frequency band F2, and two of the receiversare used as a group of the receivers of the second frequency band F2.The group of the receivers of the first frequency band F1 and the groupof the receivers of the second frequency band F2 are configured to sendthe respective received RF signals to the respective RF modules by usingthe respective second RF interfaces, so that the RF modules convert thereceived RF signals into the first baseband digital signals, and sendthe first baseband digital signals to the baseband processing unit.Corresponding descriptions in step 102 in Embodiment 1 may be referredto for details about how a group of the receivers of the first frequencyband F1 and a group of the receivers of the second frequency band F2 tosend the respective received RF signals to the respective RF modules byusing the respective second RF interfaces. Therefore, the details arenot repeated herein in the embodiment of the present invention.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and the other two of the receivers are used as theremaining receivers of the first frequency band F1; there are fourreceivers corresponding to the second frequency band F2, and the othertwo of the receivers are used as the remaining receivers of the secondfrequency band F2; and there are four receivers corresponding to thethird frequency band F3. The remaining receivers of the first frequencyband F1, the remaining receivers of the second frequency band F2, andmultiple receivers of the third frequency band F3 are configured toconvert the respective received RF signals into the second basebanddigital signals, and send the second baseband digital signals to thebaseband processing unit by using a digital baseband interface.

In addition, when the multi-frequency combiner/divider 51 is configuredin a dividing manner, the number of the second RF interfaces is equal tothat of the first RF interfaces; or when the multi-frequencycombiner/divider 51 is configured in a combining manner, the number ofthe second RF interfaces is smaller than the number of the first RFinterfaces.

It should be noted that, the digital baseband interface may be a CommonPublic Radio Interface (CPRI), and may also be an Open Base StationArchitecture Initiative (OBSAI) interface, which is not limited by theembodiment of the present invention.

In addition, the multi-frequency receiver further includes a TMA (notshown), and the TMA is configured to amplify the RF signals before theRF signals are sent to an air interface by using the multi-frequencyreceiver and the antenna.

In the embodiment of the present invention, the multi-frequency receiverdivides the RF signals by frequency bands received from an antenna toobtain the RF signals of the different frequency bands; sends the firstgroup of the RF signals of the predetermined frequency band to the RFunit so that the RF unit converts the received first group of the RFsignals of the predetermined frequency band into the first basebanddigital signals and sends the first baseband digital signals to thebaseband processing unit; and converts the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and sends the second baseband digital signals to thebaseband processing unit. In this way, the baseband processing unit canreceive multiple channels of received signals corresponding to thedifferent frequency bands, and the number of the channels in which thenetwork system receives the RF signals corresponding to the differentfrequency bands is increased without adding any antenna, therebyimproving reception performance of the network system. In addition, inthe technical solution according to the embodiment of the presentinvention, the baseband digital signals corresponding to the secondgroup of the RF signals of the predetermined frequency band are sent tothe baseband processing unit only by using the digital basebandinterface of the multi-frequency receiver, so that multi-reception isachieved in a simple manner.

In addition, in the embodiment of the present invention, themulti-frequency receiver may further include a TMA so as to amplify theRF signals before the RF signals are sent, thereby reducing interferenceof the sending of the RF signals.

The multi-frequency receiver is described in detail with reference toFIG. 4 in the preceding embodiment. Obviously, the multi-frequencyreceiver may also be described with reference to FIG. 20, and specificprocessing procedures thereof are substantially the same as those inFIG. 4, which are not repeated herein.

Embodiment 4

According to the embodiment of the present invention, a multi-frequencyreceiver is provided, and as shown in FIG. 9, the multi-frequencyreceiver includes a multi-frequency combiner/divider 61 and multiplereceivers 62. Each frequency band corresponds to multiple receivers, oneor more digital baseband interfaces, one or more first RF interfacesconnected to an antenna, and one or more second RF interfaces connectedto an RF unit.

The multi-frequency combiner/divider 61 is configured to distribute RFsignals received by the antenna to receivers 62 of a predeterminedfrequency band by frequency bands.

A first group of the receivers 62 of the predetermined frequency bandare configured to send RF signals received by such receivers to the RFunit by using a second RF interface, so that the RF unit converts thereceived RF signals into first baseband digital signals and sends thefirst baseband digital signals to a baseband processing unit. A secondgroup of the receivers 62 of the predetermined frequency band areconfigured to convert RF signals received by such receivers into secondbaseband digital signals, and send the second baseband digital signalsto the RF unit, so that the RF unit sends the second baseband digitalsignals to the baseband processing unit.

When the predetermined frequency band includes a first frequency bandand the RF unit includes a first RF module, the first group of thereceivers 62 of the predetermined frequency band are configured to sendRF signals received by such receivers to the first RF unit by using asecond RF interface, so that the first RF unit converts the received RFsignals into the first baseband digital signals and sends the firstbaseband digital signals to the baseband processing unit. The secondgroup of the receivers of the predetermined frequency band areconfigured to convert RF signals received by such receivers into thesecond baseband digital signals, and send the second baseband digitalsignals to the RF unit by using a digital baseband interface, so thatthe RF unit sends the second baseband digital signals to the basebandprocessing unit. When the first frequency band includes F1, details areas follows.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and two of the receivers are used as a group of thereceivers of the first frequency band. The group of receivers of thefirst frequency band F1 are configured to send RF signals received bysuch receivers to the first RF module by using a second RF interface, sothat the first RF module converts the received RF signals into the firstbaseband digital signals and sends the first baseband digital signals tothe baseband processing unit. Corresponding descriptions in step 102 inEmbodiment 1 may be referred to for details about how a group of thereceivers of the first frequency band F1 to send the received RF signalsto the first RF module by using a second RF interface. Therefore, thedetails are not repeated herein in the embodiment of the presentinvention.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and the other two of the receivers are used as theremaining receivers of the first frequency band F1. The remainingreceivers of the first frequency band F1 are configured to convert RFsignals received by such receivers into the second baseband digitalsignals, and send the second baseband digital signals to the first RFmodule by using a digital baseband interface, so that the first RFmodule sends the second baseband digital signals to the basebandprocessing unit.

When the predetermined frequency band includes a first frequency bandand a second frequency band, and the RF unit includes a first RF moduleand a second RF module, the first group of the receivers 62 of thepredetermined frequency band are configured to send RF signals receivedby such receivers to corresponding RF modules by using the second RFinterfaces, so that the RF modules convert the received RF signals intothe first baseband digital signals, and send the first baseband digitalsignals to the baseband processing unit. The second group of thereceivers 62 of the predetermined frequency band are configured toconvert RF signals received by such receivers into the second basebanddigital signals, and send the second baseband digital signals to thecorresponding RF modules by using the digital baseband interfaces, sothat the RF modules send the second baseband digital signals to thebaseband processing unit. Details of the corresponding RF modules are asfollows.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and two of the receivers are used as a group of thereceivers of the first frequency band F1; and there are four receiverscorresponding to the second frequency band F2, and two of the receiversare used as a group of the receivers of the second frequency band F2.The group of the receivers of the first frequency band F1 and the groupof the receivers of the second frequency band F2 are configured to sendthe respective received RF signals to the respective RF modules by usingthe respective second RF interfaces, so that the RF modules convert thereceived RF signals into the first baseband digital signals, and sendthe first baseband digital signals to the baseband processing unit.Corresponding descriptions in step 102 in Embodiment 1 may be referredto for details about how a group of the receivers of the first frequencyband F1 and a group of the receivers of the second frequency band F2 tosend the respective received RF signals to the respective RF modules byusing the respective second RF interfaces. Therefore, the details arenot repeated herein in the embodiment of the present invention.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and the other two of the receivers are used as theremaining receivers of the first frequency band F1; and there are fourreceivers corresponding to the second frequency band F2, and the othertwo of the receivers are used as the remaining receivers of the secondfrequency band F2. The remaining receivers of the first frequency bandF1 and remaining receivers of the second frequency band F2 areconfigured to convert the respective received RF signals into the secondbaseband digital signals, and send the second baseband digital signalsto the corresponding RF modules by using a digital baseband interface,so that the RF modules send the second baseband digital signals to thebaseband processing unit.

When the predetermined frequency band includes a first frequency band, asecond frequency band, and a third frequency band, and the RF unitincludes a first RF module, a second RF module, and a third RF module,the first group of the receivers of the predetermined frequency band areconfigured to send RF signals received by such receivers to the RF unitby using a second RF interface, so that the RF unit converts thereceived RF signals into the first baseband digital signals, and sendsthe first baseband digital signals to the baseband processing unit. Thesecond group of the receivers of the predetermined frequency band areconfigured to convert RF signals received by such receivers into thesecond baseband digital signals, and send the second baseband digitalsignals to the RF unit by using a digital baseband interface, so thatthe RF unit sends the second baseband digital signals to the basebandprocessing unit. When the first frequency band includes F1, the secondfrequency band includes F2, and the third frequency band includes F3,details are as follows.

Referring to FIG. 4, the number of the receivers corresponding to thefirst frequency band F1 is 4, and two of the receivers are used as agroup of the receivers of the first frequency band F1; the number of thereceivers corresponding to the second frequency band F2 is 4, and two ofthe receivers are used as a group of the receivers of the secondfrequency band F2. The group of the receivers of the first frequencyband F1 and the group of receivers of the second frequency band F2 areconfigured to send the respective received RF signals to the respectiveRF modules by using the respective second RF interfaces, so that the RFmodules convert the received RF signals into the first baseband digitalsignals, and send the first baseband digital signals to the basebandprocessing unit.

Referring to FIG. 4, there are four receivers corresponding to the firstfrequency band F1, and the other two of the receivers are used as theremaining receivers of the first frequency band F1; there are fourreceivers corresponding to the second frequency band F2, and the othertwo of the receivers are used as the remaining receivers of the secondfrequency band F2; and the number of the receivers corresponding to thethird frequency band F3 is 4. The remaining receivers of the firstfrequency band F1, the remaining receivers of the second frequency bandF2, and multiple receivers of the third frequency band F3 are configuredto convert the respective received RF signals into the second basebanddigital signals, and send the second baseband digital signals to thecorresponding RF modules by using the digital baseband interfaces, sothat the RF modules send the second baseband digital signals to thebaseband processing unit.

In addition, when the multi-frequency combiner/divider is configured ina dividing manner, the number of the second RF interfaces is equal tothat of the first RF interfaces; or when the multi-frequencycombiner/divider is configured in a combining manner, the number of thesecond RF interfaces is smaller than that of the first RF interfaces.

It should be noted that, the digital baseband interface may be a CPRI,and may also be an OBSAI interface, which is not limited by theembodiment of the present invention.

In addition, the multi-frequency receiver further includes a TMA (notshown), and the TMA is configured to amplify the RF signals before theRF signals are sent to an air interface by using the multi-frequencyreceiver and the antenna.

In the embodiment of the present invention, the multi-frequency receiverdivides RF signals by frequency bands received from an antenna to obtainthe RF signals of different frequency bands; sends the first group ofthe RF signals of the predetermined frequency band to the RF unit sothat the RF unit converts the received first group of the RF signals ofthe predetermined frequency band into the first baseband digital signalsand sends the first baseband digital signals to the baseband processingunit; and converts the second group of the RF signals of thepredetermined frequency band into the second baseband digital signalsand sends the second baseband digital signals to the RF unit, to enablethe RF unit to forward the second baseband digital signals to thebaseband processing unit. In this way, the baseband processing unit canreceive multiple channels of received signals corresponding to thedifferent frequency bands, and the number of the channels in which thenetwork system receives the RF signals corresponding to the differentfrequency bands is increased without adding any antenna, therebyimproving reception performance of the network system. In addition,according to the embodiment of the present invention, the basebanddigital signals corresponding to the second group of the RF signals ofthe predetermined frequency band are sent to the baseband processingunit only by using the digital baseband interface of the multi-frequencyreceiver, so that multi-reception is achieved in a simple manner.

In addition, in the embodiment of the present invention, themulti-frequency receiver may further include a TMA so as to amplify theRF signals before the RF signals are sent, thereby reducing interferenceof the sending of the RF signals.

The multi-frequency receiver is described in detail with reference toFIG. 4 in the above embodiment. Obviously, the multi-frequency receivermay also be described with reference to FIG. 20, and specific processingprocedures thereof are substantially the same as those in FIG. 4, whichare not repeated herein.

Embodiment 5

According to the embodiment of the present invention, a wirelesscommunication system is provided, and as shown in FIG. 10, the systemincludes a multi-frequency receiver 71.

The multi-frequency receiver 71 includes one or more digital basebandinterfaces, one or more first RF interfaces connected to an antenna, andone or more second RF interfaces connected to an RF unit, as shown inFIG. 8 of the Embodiment 3.

The multi-frequency receiver 71 is configured to divide RF signals byfrequency bands received by using a first RF interface from the antennato obtain RF signals of different frequency bands; send a first group ofRF signals of a predetermined frequency band to the RF unit by using afirst RF interface so that the RF unit converts the received first groupof the RF signals of the predetermined frequency band into firstbaseband digital signals and sends the first baseband digital signals toa baseband processing unit; and convert the second group of the RFsignals of the predetermined frequency band into second baseband digitalsignals and send the second baseband digital signals to the basebandprocessing unit by using a digital baseband interface.

Furthermore, as shown in FIG. 11, the multi-frequency receiver 71further includes a multi-frequency combiner/divider 711 and receivers712, and each frequency band corresponds to multiple receivers 712.

The multi-frequency combiner/divider 711 is configured to divide the RFsignals by frequency bands received from the antenna to obtain the RFsignals of different frequency bands, and distribute the RF signals tothe receivers 712 of the predetermined frequency band by frequencybands.

A first group of the receivers 712 of the predetermined frequency bandare configured to send the first group of the RF signals of thepredetermined frequency band to the RF unit by using a second RFinterface, so that the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit. The second group of thereceivers 712 of the predetermined frequency band are configured toconvert the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals, and send thesecond baseband digital signals to the baseband processing unit by usinga digital baseband interface.

When the predetermined frequency band includes a first frequency bandand the RF unit includes a first RF module, the first group of thereceivers 712 of the predetermined frequency band being configured tosend the first group of the RF signals of the predetermined frequencyband to the RF unit by using a second RF interface so that the RF unitconverts the received RF signals into the first baseband digital signalsand sends the first baseband digital signals to the baseband processingunit; and the second group of the receivers 712 of the predeterminedfrequency band being configured to convert the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and send the second baseband digital signals to thebaseband processing unit by using a digital baseband interfacespecifically includes the following details.

A group of the receivers of the first frequency band are configured tosend RF signals received by such receivers to the first RF module byusing a second RF interface, so that the first RF module converts thereceived RF signals into the first baseband digital signals and sendsthe first baseband digital signals to the baseband processing unit.

Remaining receivers of the first frequency band are configured toconvert RF signals received by such receivers into the second basebanddigital signals, and send the second baseband digital signals to thebaseband processing unit by using a digital baseband interface.

When the predetermined frequency band includes a first frequency bandand a second frequency band, and the RF unit includes a first RF moduleand a second RF module, the first group of the receivers 712 of thepredetermined frequency band being configured to send the first group ofthe RF signals of the predetermined frequency band to the RF unit byusing a second RF interface so that the RF unit converts the received RFsignals into the first baseband digital signals and sends the firstbaseband digital signals to the baseband processing unit; and the secondgroup of the receivers 712 of the predetermined frequency band beingconfigured to convert the second group of the RF signals of thepredetermined frequency band into the second baseband digital signalsand send the second baseband digital signals to the baseband processingunit by using a digital baseband interface specifically includes thefollowing details.

A group of the receivers of the first frequency band and a group ofreceivers of the second frequency band are configured to send therespective received RF signals to the respective RF modules by using therespective second RF interfaces, so that the RF modules convert thereceived RF signals into the first baseband digital signals and send thefirst baseband digital signals to the baseband processing unit.

The remaining receivers of the first frequency band and remainingreceivers of the second frequency band are configured to convert therespective received RF signals into the second baseband digital signals,and send the second baseband digital signals to the baseband processingunit by using a digital baseband interface.

When the predetermined frequency band includes a first frequency band, asecond frequency band, and a third frequency band, and the RF unitincludes a first RF module, a second RF module, and a third RF module,the first group of the receivers 712 of the predetermined frequency bandbeing configured to send the first group of the RF signals of thepredetermined frequency band to the RF unit by using a second RFinterface so that the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit; and the second group of thereceivers 712 of the predetermined frequency band being configured toconvert the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals and send thesecond baseband digital signals to the baseband processing unit by usinga digital baseband interface specifically includes the followingdetails.

A group of the receivers of the first frequency band and a group of thereceivers of the second frequency band are configured to send therespective received RF signals to the respective RF modules by using therespective second RF interfaces, so that the RF modules convert thereceived RF signals into the first baseband digital signals and send thefirst baseband digital signals to the baseband processing unit.

The remaining receivers of the first frequency band, the remainingreceivers of the second frequency band, and multiple receivers of athird frequency band are configured to convert the respective receivedRF signals into the second baseband digital signals, and send the secondbaseband digital signals to the baseband processing unit by using adigital baseband interface.

In addition, as shown in FIG. 12, the system further includes: abaseband processing unit 72 and an RF unit 73. The RF unit 73 includes afirst RF module 731, and the first RF module 731 corresponds to a firstfrequency band F1 of the predetermined frequency band.

The first RF module 731 is configured to receive a first group of the RFsignals of the first frequency band sent by the multi-frequency receiver71, convert the first group of the RF signals of the first frequencyband into the first baseband digital signals, and send the firstbaseband digital signals to the baseband processing unit 72. Thebaseband processing unit 72 is configured to receive the first basebanddigital signals sent by the first RF module 731 and the second basebanddigital signals that are obtained by converting the remaining RF signalsof the first frequency band and sent by the multi-frequency receiver 71by using a digital baseband interface, and perform baseband processingon the first baseband digital signals and the second baseband digitalsignals.

Furthermore, as shown in FIG. 13, the RF unit 73 of the system furtherincludes: a second RF module 732. The second RF module 732 correspondsto a second frequency band F2 of the predetermined frequency band.

The second RF module 732 is configured to receive a first group of theRF signals of the second frequency band sent by the multi-frequencyreceiver 71, convert the received first group of the RF signals of thesecond frequency band into the first baseband digital signals, and sendthe first baseband digital signals to the baseband processing unit 72.

The baseband processing unit 72 is configured to receive the firstbaseband digital signals sent by the second RF module 732 and the secondbaseband digital signals that are obtained by converting the remainingRF signals of the second frequency band and sent by the multi-frequencyreceiver 71 by using a digital baseband interface, and perform thebaseband processing on the first baseband digital signals and the secondbaseband digital signals.

Furthermore, as shown in FIG. 14, the RF unit 73 further includes: athird RF module 733. The third RF module 733 corresponds to a thirdfrequency band F3 of the predetermined frequency band.

The third RF module 733 is configured to receive RF signals of the thirdfrequency band from another antenna, convert the RF signals of the thirdfrequency band from the antenna into the third baseband digital signals,and send the third baseband digital signals to the baseband processingunit 72.

The baseband processing unit 72 is further configured to receive thethird baseband digital signals sent by the third RF module 733 and thesecond baseband digital signals that are obtained by converting theremaining RF signals of the third frequency band and sent by themulti-frequency receiver 71 by using a digital baseband interface, andperform the baseband processing on the first baseband digital signalsand the second baseband digital signals.

It should be noted that, the digital baseband interface may be a CPRI,which is not limited by the embodiment of the present invention, and mayalso be an OBSAI interface.

In addition, the multi-frequency receiver 71 may be mounted at the topof an outdoor tower or indoors, which is not limited by the embodimentof the present invention, and a user can make a choice according tospecific conditions.

Corresponding descriptions in Embodiment 1 and Embodiment 3 may bereferred to for other descriptions of the corresponding functionalmodules in the embodiment of the present invention. Therefore, they arenot repeated herein in the embodiment of the present invention.

In the embodiment of the present invention, the multi-frequency receiverdivides the RF signals by frequency bands received from an antenna toobtain the RF signals of the different frequency bands; sends the firstgroup of the RF signals of the predetermined frequency band to the RFunit so that the RF unit converts the received first group of the RFsignals of the predetermined frequency band into the first basebanddigital signals and sends the first baseband digital signals to thebaseband processing unit; and converts the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and sends the second baseband digital signals to thebaseband processing unit. In this way, the baseband processing unit canreceive multiple channels of received signals corresponding to thedifferent frequency bands, and the number of the channels in which thenetwork system receives the RF signals corresponding to the differentfrequency bands is increased without adding any antenna, therebyimproving reception performance of the network system. In addition, inthe technical solution according to the embodiment of the presentinvention, the baseband digital signals corresponding to the secondgroup of the RF signals of the predetermined frequency band are sent tothe baseband processing unit only by using the digital basebandinterface of the multi-frequency receiver, so that multi-reception isachieved in a simple manner.

In addition, in the embodiment of the present invention, themulti-frequency receiver may further include a TMA so as to amplify theRF signals before the RF signals are sent, thereby reducing interferenceof the sending of the RF signals.

Embodiment 6

According to the embodiment of the present invention, a wirelesscommunication system is provided, and as shown in FIG. 15, the systemincludes a multi-frequency receiver 81.

The multi-frequency receiver 81 includes one or more digital basebandinterfaces, one or more first RF interfaces connected to an antenna, andone or more second RF interfaces connected to an RF unit.

The multi-frequency receiver 81 is configured to divide RF signals byfrequency bands received by using a first RF interface from the antennato obtain RF signals of different frequency bands; send a first group ofRF signals of a predetermined frequency band to the RF unit by using asecond RF interface so that the RF unit converts the received firstgroup of the RF signals of the predetermined frequency band into firstbaseband digital signals and sends the first baseband digital signals toa baseband processing unit; and convert a second group of the RF signalsof the predetermined frequency band into second baseband digital signalsand send the second baseband digital signals to a first RF module byusing a digital baseband interface, so that the first RF module sendsthe second baseband digital signals to the baseband processing unit.

Furthermore, as shown in FIG. 16, the multi-frequency receiver 81further includes a multi-frequency combiner/divider 811 and receivers812, and each frequency band corresponds to multiple receivers 812.

The multi-frequency combiner/divider 811 is configured to divide RFsignals by frequency bands received from the antenna to obtain the RFsignals of different frequency bands, and distribute the RF signals tothe receivers 811 of the predetermined frequency band by frequencybands.

A first group of the receivers 812 of the predetermined frequency bandare configured to send the first group of the RF signals of thepredetermined frequency band to the RF unit by using a second RFinterface, so that the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit.

A second group of the receivers 812 of the predetermined frequency bandare configured to convert the second group of the RF signals of thepredetermined frequency band into the second baseband digital signals,and send the second baseband digital signals to the RF unit by using adigital baseband interface, so that the RF unit sends the secondbaseband digital signals to the baseband processing unit.

When the predetermined frequency band includes a first frequency bandand the RF unit includes a first RF module, the first group of thereceivers 812 of the predetermined frequency band being configured tosend the first group of the RF signals of the predetermined frequencyband to the RF unit by using a second RF interface so that the RF unitconverts the received RF signals into the first baseband digital signalsand sends the first baseband digital signals to the baseband processingunit; and the second group of the receivers 812 of the predeterminedfrequency band being configured to convert the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and send the second baseband digital signals to the RFunit by using a digital baseband interface so that the RF unit sends thesecond baseband digital signals to the baseband processing unitspecifically includes the following details.

A group of the receivers of the first frequency band are configured tosend the received RF signals to the first RF module by using a second RFinterface, so that the first RF module converts the received RF signalsinto the first baseband digital signals and sends the first basebanddigital signals to the baseband processing unit.

Remaining receivers of the first frequency band are configured toconvert RF signals received by such receivers into the second basebanddigital signals, and send the second baseband digital signals to thefirst RF module by using a digital baseband interface, so that the firstRF module sends the second baseband digital signals to the basebandprocessing unit.

When the predetermined frequency band includes a first frequency bandand a second frequency band, and the RF unit includes a first RF moduleand a second RF module, the first group of the receivers 812 of thepredetermined frequency band being configured to send the first group ofthe RF signals of the predetermined frequency band to the RF unit byusing a second RF interface so that the RF unit converts the received RFsignals into the first baseband digital signals and sends the firstbaseband digital signals to the baseband processing unit; and the secondgroup of the receivers 812 of the predetermined frequency band beingconfigured to convert the second group of the RF signals of thepredetermined frequency band into the second baseband digital signalsand send the second baseband digital signals to the RF unit by using adigital baseband interface so that the RF unit sends the second basebanddigital signals to the baseband processing unit specifically includesthe following details.

A group of the receivers of the first frequency band and a group of thereceivers of the second frequency band are configured to send therespective received RF signals to the respective RF modules by using therespective second RF interfaces, so that the RF modules convert thereceived RF signals into the first baseband digital signals and send thefirst baseband digital signals to the baseband processing unit.

The remaining receivers of the first frequency band and remainingreceivers of the second frequency band are configured to convert therespective received RF signals into the second baseband digital signals,and send the second baseband digital signals to the corresponding RFmodules by using a digital baseband interface, so that the RF modulessend the second baseband digital signals to the baseband processingunit.

When the corresponding frequency band includes a first frequency band, asecond frequency band, and a third frequency band, and the RF unitincludes a first RF module, a second RF module, and a third RF module,the first group of the receivers 812 of the predetermined frequency bandbeing configured to send the first group of the RF signals of thepredetermined frequency band to the RF unit by using a second RFinterface so that the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit; and the second group of thereceivers 812 of the predetermined frequency band being configured toconvert the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals and send thesecond baseband digital signals to the RF unit by using a digitalbaseband interface so that the RF unit sends the second baseband digitalsignals to the baseband processing unit specifically includes thefollowing details.

A group of the receivers of the first frequency band and a group of thereceivers of the second frequency band are configured to send therespective received RF signals to the respective RF modules by using therespective second RF interfaces, so that the RF modules convert thereceived RF signals into the first baseband digital signals and send thefirst baseband digital signals to the baseband processing unit.

The remaining receivers of the first frequency band and remainingreceivers of the second frequency band are configured to convert therespective received RF signals into the second baseband digital signals,and send the second baseband digital signals to the corresponding RFmodules by using a digital baseband interface, so that the RF modulessend the second baseband digital signals to the baseband processingunit.

Multiple receivers of the third frequency band are configured to convertRF signals received by such receivers into the second baseband digitalsignals, and send the second baseband digital signals to the third RFmodule by using a digital baseband interface, so that the third RFmodule sends the second baseband digital signals to the basebandprocessing unit.

In addition, as shown in FIG. 17, the system further includes: abaseband processing unit 82 and an RF unit 83. The RF unit 83 includes afirst RF module 831, and the first RF module 831 corresponds to a firstfrequency band F1 of the predetermined frequency band.

The first RF module 831 is configured to receive a first group of the RFsignals of the first frequency band sent by the multi-frequency receiver81, convert the first group of the RF signals of the first frequencyband into the first baseband digital signals, and send the firstbaseband digital signals to the baseband processing unit 82; and receivethe second baseband digital signals that are obtained by converting theremaining RF signals of the first frequency band and sent by themulti-frequency receiver 81 by using a digital baseband interface, andsend the second baseband digital signals to the baseband processing unit82.

The baseband processing unit 82 is configured to receive the firstbaseband digital signals and the second baseband digital signals sent bythe first RF module 831, and perform baseband processing on the firstbaseband digital signals and the second baseband digital signals.

Furthermore, as shown in FIG. 18, the RF unit 83 further includes: asecond RF module 832. The second RF module 832 corresponds to a secondfrequency band F2 of the predetermined frequency band.

The second RF module 83 is configured to receive a first group of the RFsignals of the second frequency band sent by the multi-frequencyreceiver 81, convert the first group of the RF signals of the secondfrequency band into the first baseband digital signals, and send thefirst baseband digital signals to the baseband processing unit 82; andreceive the second baseband digital signals that are obtained byconverting the remaining RF signals of the second frequency band andsent by the multi-frequency receiver 81 by using a digital basebandinterface, and send the second baseband digital signals to the basebandprocessing unit 82.

The baseband processing unit 82 is further configured to receive thefirst baseband digital signals and the second baseband digital signalssent by the second RF module 832, and perform the baseband processing onthe first baseband digital signals and the second baseband digitalsignals.

Furthermore, as shown in FIG. 19, the RF unit 83 further includes: athird RF module 833. The third RF module 833 corresponds to a thirdfrequency band F3 of the predetermined frequency band.

The third RF module 833 is configured to receive the second basebanddigital signals that are obtained by converting the RF signals of thethird frequency band and sent by the multi-frequency receiver 81 byusing a digital baseband interface, and send the second baseband digitalsignals to the baseband processing unit 82; and receive RF signals ofthe third frequency band from another antenna, convert the RF signals ofthe third frequency band from the antenna into third baseband digitalsignals, and send the third baseband digital signals to the basebandprocessing unit 82.

The baseband processing unit 82 is further configured to receive thesecond baseband digital signals and the third baseband digital signalssent by the third RF module 833, and perform the baseband processing onthe second baseband digital signals and the third baseband digitalsignals.

It should be noted that, the digital baseband interface may be a CPRI,which is not limited by the embodiment of the present invention, and mayalso be an OBSAI interface.

In addition, the multi-frequency receiver 81 may be mounted at the topof an outdoor tower or indoors, which is not limited by the embodimentof the present invention, and a user can make a choice according tospecific conditions.

It should be noted that, the baseband processing unit 82 and the RF unit83 may be separate functional modules, and the baseband processing unit82 may also be integrated into the RF unit 83, which is not limited bythe embodiment of the present invention and can be disposed specificallyaccording to requirements of the user.

Corresponding descriptions in Embodiment 2 and Embodiment 4 may bereferred to for other descriptions of the corresponding functionalmodules in the embodiment of the present invention. Therefore, they arenot repeated herein in the embodiment of the present invention.

In the embodiment of the present invention, the multi-frequency receiverdivides RF signals by frequency bands received from the antenna toobtain the RF signals of different frequency bands; sends the firstgroup of the RF signals of the predetermined frequency band to the RFunit so that the RF unit converts the received first group of the RFsignals of the predetermined frequency band into the first basebanddigital signals and sends the first baseband digital signals to thebaseband processing unit; and converts the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and sends the second baseband digital signals to the RFunit, to enable the RF unit to forward the second baseband digitalsignals to the baseband processing unit. In this way, the basebandprocessing unit can receive multiple channels of received signalscorresponding to the different frequency bands, and the number of thechannels in which the network system receives the RF signals of thedifferent frequency bands is increased without adding any antenna,thereby improving reception performance of the network system. Inaddition, in the technical solution according to the embodiment of thepresent invention, the baseband digital signals corresponding to thesecond group of the RF signals of the predetermined frequency band aresent to the baseband processing unit only by using the digital basebandinterface of the multi-frequency receiver, so that multi-reception isachieved in a simple manner.

In addition, in the embodiment of the present invention, themulti-frequency receiver may further include a TMA so as to amplify theRF signals before the RF signals are sent, thereby reducing interferenceof the sending of the RF signals.

It should be noted that, embodiments corresponding to FIG. 12 and FIG.17 may be implemented separately or in a combined manner. Whenimplemented in a combined manner, specifically which link manner of thedigital baseband interface is to be used is determined according to achoice of a user. Corresponding descriptions in FIG. 12 and FIG. 17 maybe referred to for detailed descriptions, for example, the sending, bythe multi-frequency receiver, the first group of the RF signals of thepredetermined frequency band (such as the first frequency band F1) tothe RF unit (such as the first RF module) by using a first RF interface;converting the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals, and sending thesecond baseband digital signals to the baseband processing unit by usinga digital baseband interface; and converting a third group of the RFsignals into third baseband digital signals, and sending the thirdbaseband digital signals to the RF unit by using a digital basebandinterface. Therefore, they are not repeated herein in the embodiment ofthe present invention. Furthermore, embodiments corresponding to FIG. 13and FIG. 18 may be implemented separately or in a combined manner. Whenimplemented in the combined manner, specifically which link manner ofthe digital baseband interface is to be used is determined according toa choice of a user. Corresponding descriptions in FIG. 13 and FIG. 18may be referred to for detailed descriptions, which are not repeatedherein in the embodiment of the present invention. Furthermore,embodiments corresponding to FIG. 14 and FIG. 19 may be implementedseparately or in a combined manner. When implemented in the combinedmanner, specifically which link manner of the digital baseband interfaceis to be used is determined according to a choice of a user.Corresponding descriptions in FIG. 14 and FIG. 19 may be referred to fordetailed descriptions, which are not repeated herein in the embodimentof the present invention.

Through the above description of the embodiments, it is apparent topersons skilled in the art that the present invention may beaccomplished by software plus necessary universal hardware, anddefinitely may also be accomplished by hardware, but in most cases, thepresent invention is preferably implemented by using the former method.Based on this, the technical solution of the present invention or thepart that makes contributions to the prior art can be substantiallyembodied in the form of a software product. The computer softwareproduct may be stored in the readable storage media, for example, afloppy disk, hard disk, or optical disk of the computer, and containseveral instructions adapted to instruct computer equipment (forexample, a personal computer, a server, or network equipment) to performthe method according to the embodiments of the present invention.

In conclusion, the above are merely exemplary embodiments of the presentinvention. However, the scope of the present invention is not limitedthereto. Changes or replacements readily apparent to persons skilled inthe prior art within the technical scope of the present invention shouldfall within the scope of the present invention. Therefore, theprotection scope of the present invention is subject to the appendedclaims.

1. A communication signal transmission method, comprising: receiving, bya multi-frequency receiver, Radio Frequency (RF) signals from anantenna, and dividing the RF signals into RF signals of differentfrequency bands by frequency bands; sending a first group of RF signalsof a predetermined frequency band to an RF unit, and thereafter the RFunit converts the received RF signals into first baseband digitalsignals and sends the first baseband digital signals to a basebandprocessing unit; and converting a second group of the RF signals of thepredetermined frequency band into second baseband digital signals, andsending the second baseband digital signals to the baseband processingunit.
 2. The method according to claim 1, wherein sending the firstgroup of the RF signals of the predetermined frequency band to the RFunit so that the RF unit converts the received RF signals into the firstbaseband digital signals and sends the first baseband digital signals tothe baseband processing unit comprises: sending a group of RF signals ofa first frequency band to a first RF module, and thereafter the first RFmodule converts the received RF signals into the first baseband digitalsignals and sends the first baseband digital signals to the basebandprocessing unit; and wherein the converting the second group of the RFsignals of the predetermined frequency band into the second basebanddigital signals and sending the second baseband digital signals to thebaseband processing unit comprises: converting remaining RF signals ofthe first frequency band into the second baseband digital signals, andsending the second baseband digital signals to the baseband processingunit.
 3. A communication signal transmission method, comprising:receiving, by a baseband processing unit, second baseband digitalsignals of a predetermined frequency band sent by a multi-frequencyreceiver and first baseband digital signals of the predeterminedfrequency band sent by a Radio Frequency (RF) unit; and performingbaseband processing on the first baseband digital signals and the secondbaseband digital signals.
 4. The method according to claim 3, whereinthe second baseband digital signals are obtained by converting a secondgroup of RF signals of a predetermined frequency band received by themulti-frequency receiver; and the first baseband digital signals areobtained by converting, by the RF unit, a first group of the RF signalsof the predetermined frequency band received by the multi-frequencyreceiver.
 5. A communication signal transmission method, comprising:receiving, by a multi-frequency receiver, Radio Frequency (RF) signalsfrom an antenna, and dividing the RF signals into RF signals ofdifferent frequency bands by frequency bands; sending a first group ofRF signals of a predetermined frequency band to an RF unit, wherein theRF unit converts the received RF signals into first baseband digitalsignals and sends the first baseband digital signals to a basebandprocessing unit; and converting a second group of the RF signals of thepredetermined frequency band into second baseband digital signals, andsending the second baseband digital signals to the RF unit, wherein theRF unit sends the second baseband digital signals to the basebandprocessing unit.
 6. The method according to claim 5, wherein sending thefirst group of the RF signals of the predetermined frequency band to theRF unit, wherein the RF unit converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit comprises: sending a group of RFsignals of a first frequency band to a first RF module, wherein thefirst RF module converts the received RF signals into the first basebanddigital signals and sends the first baseband digital signals to thebaseband processing unit; and wherein converting the second group of theRF signals of the predetermined frequency band into the second basebanddigital signals and sending the second baseband digital signals to theRF unit, and thereby the RF unit sends the second baseband digitalsignals to the baseband processing unit comprises: converting remainingRF signals of the first frequency band into the second baseband digitalsignals, and sending the second baseband digital signals to the first RFmodule, and thereby the first RF module sends the second basebanddigital signals to the baseband processing unit.
 7. A multi-frequencyreceiver, comprising: a multi-frequency combiner/divider multiplereceivers; one or more digital baseband interfaces; one or more first RFinterfaces connected to an antenna; and one or more second RadioFrequency (RF) interfaces connected to an RF unit, wherein each of aplurality of frequency bands corresponds to multiple receivers; whereinthe multi-frequency combiner/divider is configured to distribute RFsignals received by the antenna to receivers of a predeterminedfrequency band by frequency bands; wherein a first group of thereceivers of the predetermined frequency band are configured to send RFsignals received by such receivers to the RF unit by using a second RFinterface, and thereby the RF unit converts the received RF signals intothe first baseband digital signals and sends the first baseband digitalsignals to a baseband processing unit; and wherein a second group of thereceivers of the predetermined frequency band are configured to convertRF signals received by such receivers into the second baseband digitalsignals, and send the second baseband digital signals to the basebandprocessing unit by using a digital baseband interface.
 8. Themulti-frequency receiver according to claim 7, wherein the predeterminedfrequency band comprises a first frequency band, and the RF unitcomprises a first RF module; wherein a group of receivers of the firstfrequency band are configured to send RF signals received by suchreceivers to the first RF module by using a second RF interface, andthereby the first RF module converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit; and wherein remaining receiversof the first frequency band are configured to convert RF signalsreceived by such receivers into the second baseband digital signals, andsend the second baseband digital signals to the baseband processing unitby using a digital baseband interface.
 9. The multi-frequency receiveraccording to claim 7, wherein the predetermined frequency band comprisesa first frequency band and a second frequency band, and the RF unitcomprises a first RF module and a second RF module; wherein a group ofreceivers of the first frequency band and a group of receivers of thesecond frequency band are configured to send respective received RFsignals to respective RF modules by using the respective second RFinterfaces, and thereby the RF modules convert the received RF signalsinto the first baseband digital signals and send the first basebanddigital signals to the baseband processing unit; and wherein remainingreceivers of the first frequency band and remaining receivers of thesecond frequency band are configured to convert respective received RFsignals into the second baseband digital signals, and send the secondbaseband digital signals to the baseband processing unit by using adigital baseband interface.
 10. The multi-frequency receiver accordingto claim 7, wherein the predetermined frequency band comprises a firstfrequency band, a second frequency band, and a third frequency band, andthe RF unit comprises a first RF module, a second RF module, and a thirdRF module; wherein a group of receivers of the first frequency band anda group of receivers of the second frequency band are configured to sendrespective received RF signals to the respective RF modules by using therespective second RF interfaces, and thereby the RF modules convert thereceived RF signals into the first baseband digital signals and send thefirst baseband digital signals to the baseband processing unit; andwherein remaining receivers of the first frequency band, remainingreceivers of the second frequency band, and multiple receivers of thethird frequency band are configured to convert the respective receivedRF signals into the second baseband digital signals, and send the secondbaseband digital signals to the baseband processing unit by using adigital baseband interface.
 11. The multi-frequency receiver accordingto claim 7, wherein when the multi-frequency combiner/divider isconfigured in a dividing manner, the number of the second RF interfacesis equal to that of the first RF interfaces; and when themulti-frequency combiner/divider is configured in a combining manner,the number of the second RF interfaces is smaller than that of the firstRF interfaces.
 12. The multi-frequency receiver according to claim 7,wherein the digital baseband interface is a Common Public RadioInterface (CPRI).
 13. The multi-frequency receiver according to claim 7,wherein the multi-frequency receiver further comprises a tower mountedamplifier that is configured to amplify the RF signals before the RFsignals are sent to an air interface by using the multi-frequencyreceiver and the antenna.
 14. A multi-frequency receiver, comprising: amulti-frequency combiner/divider; multiple receivers; one or moredigital baseband interfaces; one or more first RF interfaces to beconnected to an antenna; and one or more second Radio Frequency (RF)interfaces connected to an RF unit, wherein each frequency bandcorresponds to multiple receivers; wherein the multi-frequencycombiner/divider is configured to distribute RF signals received by theantenna to receivers of a predetermined frequency band by frequencybands; wherein a first group of the receivers of the predeterminedfrequency band are configured to send RF signals received by suchreceivers to the RF unit by using a second RF interface, and thereby theRF unit converts the received RF signals into first baseband digitalsignals and sends the first baseband digital signals to a basebandprocessing unit; and wherein a second group of the receivers of thepredetermined frequency band are configured to convert RF signalsreceived by such receivers into second baseband digital signals, andsend the second baseband digital signals to the RF unit by using adigital baseband interface, and thereby the RF unit sends the secondbaseband digital signals to the baseband processing unit.
 15. Themulti-frequency receiver according to claim 14, wherein thepredetermined frequency band comprises a first frequency band, and theRF unit comprises a first RF module; wherein a group of receivers of thefirst frequency band are configured to send RF signals received by suchreceivers to the first RF module by using a second RF interface, andthereby the first RF module converts the received RF signals into thefirst baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit; and wherein remaining receiversof the first frequency band are configured to convert RF signalsreceived by such receivers into the second baseband digital signals, andsend the second baseband digital signals to the first RF module by usinga digital baseband interface, and thereby the first RF module sends thesecond baseband digital signals to the baseband processing unit.
 16. Themulti-frequency receiver according to claim 14, wherein thepredetermined frequency band comprises a first frequency band and asecond frequency band, and the RF unit comprises a first RF module and asecond RF module; wherein a group of receivers of the first frequencyband and a group of receivers of the second frequency band areconfigured to send respective received RF signals to the respective RFmodules by using the respective second RF interfaces, and thereby the RFmodules convert the received RF signals into the first baseband digitalsignals and send the first baseband digital signals to the basebandprocessing unit; and wherein remaining receivers of the first frequencyband and remaining receivers of the second frequency band are configuredto convert the respective received RF signals into the second basebanddigital signals, and send the second baseband digital signals to thecorresponding RF modules by using a digital baseband interface, andthereby the RF modules send the second baseband digital signals to thebaseband processing unit.
 17. The multi-frequency receiver according toclaim 14, wherein the predetermined frequency band comprises a firstfrequency band, a second frequency band, and a third frequency band, andthe RF unit comprises a first RF module, a second RF module, and a thirdRF module; wherein a group of receivers of the first frequency band anda group t of receivers of the second frequency band are configured tosend the respective received RF signals to the respective RF modules byusing the respective second RF interfaces, and thereby the RF modulesconvert the received RF signals into the first baseband digital signalsand send the first baseband digital signals to the baseband processingunit; and wherein remaining receivers of the first frequency band,remaining receivers of the second frequency band, and multiple receiversof the third frequency band are configured to convert the respectivereceived RF signals into the second baseband digital signals, and sendthe second baseband digital signals to the corresponding RF modules byusing a digital baseband interface, and thereby the RF modules send thesecond baseband digital signals to the baseband processing unit.
 18. Themulti-frequency receiver according to claim 14, wherein when themulti-frequency combiner/divider is configured in a dividing manner, thenumber of the second RF interfaces is equal to that of the first RFinterfaces; and when the multi-frequency combiner/divider is configuredin a combining manner, the number of the second RF interfaces is smallerthan that of the first RF interfaces.
 19. The multi-frequency receiveraccording to claim 14, wherein the digital baseband interface is aCommon Public Radio Interface (CPRI).
 20. The multi-frequency receiveraccording to claim 14, wherein the multi-frequency receiver furthercomprises a tower mounted amplifier that is configured to amplify the RFsignals before the RF signals are sent to an air interface by using themulti-frequency receiver and the antenna.
 21. A wireless communicationsystem, comprising a multi-frequency receiver; wherein themulti-frequency receiver comprises one or more digital basebandinterfaces, one or more first Radio Frequency (RF) interfaces connectedto an antenna, and one or more second RF interfaces connected to an RFunit; and wherein the multi-frequency receiver is configured to divideRF signals by frequency bands received by using a first RF interfacefrom the antenna to obtain RF signals of different frequency bands; tosend a first group of RF signals of a predetermined frequency band tothe RF unit by using a first RF interface and thereby the RF unitconverts the received first group of the RF signals of the predeterminedfrequency band into first baseband digital signals and sends the firstbaseband digital signals to a baseband processing unit; and to convertthe second group of the RF signals of the predetermined frequency bandinto second baseband digital signals and send the second basebanddigital signals to the baseband processing unit by using a digitalbaseband interface.
 22. The system according to claim 21, wherein themulti-frequency receiver further comprises: a multi-frequencycombiner/divider and receivers, and each frequency band corresponds tomultiple receivers; wherein the multi-frequency combiner/divider isconfigured to divide the RF signals by frequency bands received from theantenna to obtain the RF signals of different frequency bands, anddistribute the RF signals of the different frequency bands to receiversby frequency bands; wherein a first group of the receivers of thepredetermined frequency band are configured to send the first group ofthe RF signals of the predetermined frequency band to the RF unit byusing a second RF interface, and thereby the RF unit converts thereceived RF signals into the first baseband digital signals and sendsthe first baseband digital signals to the baseband processing unit; andwherein a second group of the receivers of the predetermined frequencyband are configured to convert the second group of the RF signals of thepredetermined frequency band into the second baseband digital signals,and send the second baseband digital signals to the baseband processingunit by using a digital baseband interface.
 23. The system according toclaim 22, wherein the predetermined frequency band comprises a firstfrequency band, and the RF unit comprises a first RF module; wherein agroup of receivers of the first frequency band are configured to send RFsignals received by such receivers to the first RF module by using asecond RF interface, and thereby the first RF module converts thereceived RF signals into the first baseband digital signals and sendsthe first baseband digital signals to the baseband processing unit; andwherein remaining receivers of the first frequency band are configuredto convert RF signals received by such receivers into the secondbaseband digital signals, and send the second baseband digital signalsto the baseband processing unit by using a digital baseband interface.24. The system according to claim 22, wherein the predeterminedfrequency band comprises a first frequency band and a second frequencyband, and the RF unit comprises a first RF module and a second RFmodule; wherein a group of receivers of the first frequency band and agroup of receivers of the second frequency band are configured to sendthe respective received RF signals to the respective RF modules by usingthe respective second RF interfaces, and thereby the RF modules convertthe received RF signals into the first baseband digital signals and sendthe first baseband digital signals to the baseband processing unit; andwherein remaining receivers of the first frequency band and remainingreceivers of the second frequency band are configured to convert therespective received RF signals into the second baseband digital signals,and send the second baseband digital signals to the baseband processingunit by using a digital baseband interface.
 25. The system according toclaim 22, wherein the predetermined frequency band comprises a firstfrequency band, a second frequency band, and a third frequency band, andthe RF unit comprises a first RF module, a second RF module, and a thirdRF module; wherein a group of receivers of the first frequency band anda group of receivers of the second frequency band are configured to sendthe respective received RF signals to the respective RF modules by usingthe respective second RF interfaces, and thereby the RF modules convertthe received RF signals into the first baseband digital signals and sendthe first baseband digital signals to the baseband processing unit; andwherein remaining receivers of the first frequency band, remainingreceivers of the second frequency band, and multiple receivers of thethird frequency band are configured to convert the respective receivedRF signals into the second baseband digital signals, and send the secondbaseband digital signals to the baseband processing unit by using adigital baseband interface.
 26. The system according to claim 21,further comprising the baseband processing unit, wherein the RF unitcomprises a first RF module, and the first RF module corresponds to afirst frequency band of the predetermined frequency band; wherein thefirst RF module is configured to receive the first group of the RFsignals of the first frequency band sent by the multi-frequencyreceiver, convert the first group of the RF signals of the firstfrequency band into the first baseband digital signals, and send thefirst baseband digital signals to the baseband processing unit; andwherein the baseband processing unit is configured to receive the firstbaseband digital signals sent by the first RF module and the secondbaseband digital signals that are obtained by converting the remainingRF signals of the first frequency band and sent by the multi-frequencyreceiver by using a digital baseband interface, and perform basebandprocessing on the first baseband digital signals and the second basebanddigital signals.
 27. The system according to claim 26, wherein the RFunit further comprises a second RF module, wherein the second RF modulecorresponds to a second frequency band of the predetermined frequencyband; wherein the second RF module is configured to receive a firstgroup of the RF signals of the second frequency band sent by themulti-frequency receiver, convert the received first group of the RFsignals of the second frequency band into the first baseband digitalsignals, and send the first baseband digital signals to the basebandprocessing unit; and wherein the baseband processing unit is configuredto receive the first baseband digital signals sent by the second RFmodule and the second baseband digital signals that are obtained byconverting the remaining RF signals of the second frequency band andsent by the multi-frequency receiver by using a digital basebandinterface, and perform the baseband processing on the first basebanddigital signals and the second baseband digital signals.
 28. The systemaccording to claim 26, wherein the RF unit further comprises a third RFmodule, wherein the third RF module corresponds to a third frequencyband of the predetermined frequency band; wherein the third RF module isconfigured to receive RF signals of the third frequency band fromanother antenna, convert the RF signals of the third frequency band fromthe antenna into third baseband digital signals, and send the thirdbaseband digital signals to the baseband processing unit; and whereinthe baseband processing unit is further configured to receive the thirdbaseband digital signals sent by the third RF module and the secondbaseband digital signals that are obtained by converting the remainingRF signals of the third frequency band and sent by the multi-frequencyreceiver by using a digital baseband interface, and perform the basebandprocessing on the first baseband digital signals and the second basebanddigital signals.
 29. The system according to claim 21, wherein thedigital baseband interface is a Common Public Radio Interface (CPRI).30. A wireless communication system, comprising a multi-frequencyreceiver; wherein the multi-frequency receiver comprises one or moredigital baseband interfaces, one or more first Radio Frequency (RF)interfaces connected to an antenna, and one or more second RF interfacesconnected to an RF unit; and wherein the multi-frequency receiver isconfigured to divide RF signals by frequency bands received by using afirst RF interface from the antenna to obtain RF signals of differentfrequency bands; to send a first group of RF signals of a predeterminedfrequency band to the RF unit by using a second RF interface, andthereby the RF unit converts the received first group of the RF signalsof the predetermined frequency band into first baseband digital signalsand sends the first baseband digital signals to a baseband processingunit; and to convert a second group of the RF signals of thepredetermined frequency band into second baseband digital signals andsend the second baseband digital signals to a first RF module by using adigital baseband interface, and thereby the first RF module sends thesecond baseband digital signals to the baseband processing unit.
 31. Thesystem according to claim 30, wherein the multi-frequency receiverfurther comprises: a multi-frequency combiner/divider and receivers, andeach frequency band corresponds to multiple receivers; wherein themulti-frequency combiner/divider is configured to divide the RF signalsby frequency bands received from the antenna to obtain the RF signals ofdifferent frequency bands, and distribute the RF signals of thedifferent frequency bands to receivers by frequency bands; wherein afirst group of the receivers of the predetermined frequency band areconfigured to send the first group of the RF signals of thepredetermined frequency band to the RF unit by using a second RFinterface, and thereby the RF unit converts the received RF signals intothe first baseband digital signals and sends the first baseband digitalsignals to the baseband processing unit; and wherein a second group ofthe receivers of the predetermined frequency band are configured toconvert the second group of the RF signals of the predeterminedfrequency band into the second baseband digital signals, and send thesecond baseband digital signals to the RF unit by using a digitalbaseband interface, and thereby the RF unit sends the second basebanddigital signals to the baseband processing unit.
 32. The systemaccording to claim 31, wherein the predetermined frequency bandcomprises a first frequency band, and the RF unit comprises a first RFmodule; wherein a group of receivers of the first frequency band areconfigured to send RF signals received by such receivers to the first RFmodule by using a second RF interface, and thereby the first RF moduleconverts the received RF signals into the first baseband digital signalsand sends the first baseband digital signals to the baseband processingunit; and wherein remaining receivers of the first frequency band areconfigured to convert RF signals received by such receivers into thesecond baseband digital signals, and send the second baseband digitalsignals to the first RF module by using a digital baseband interface,and thereby the first RF module sends the second baseband digitalsignals to the baseband processing unit.
 33. The system according toclaim 31, wherein the predetermined frequency band comprises a firstfrequency band and a second frequency band, and the RF unit comprises afirst RF module and a second RF module; wherein a group of receivers ofthe first frequency band and a group of receivers of the secondfrequency band are configured to send respective received RF signals tothe respective RF modules by using the respective second RF interfaces,and thereby the RF modules convert the received RF signals into thefirst baseband digital signals and send the first baseband digitalsignals to the baseband processing unit; and wherein remaining receiversof the first frequency band and remaining receivers of the secondfrequency band are configured to convert the respective received RFsignals into the second baseband digital signals, and send the secondbaseband digital signals to the corresponding RF modules by using adigital baseband interface, and thereby the RF modules send the secondbaseband digital signals to the baseband processing unit.
 34. The systemaccording to claim 31, wherein the predetermined frequency bandcomprises a first frequency band, a second frequency band, and a thirdfrequency band, and the RF unit comprises a first RF module, a second RFmodule, and a third RF module; wherein a group of receivers of the firstfrequency band and a group of receivers of the second frequency band areconfigured to send the respective received RF signals to the respectiveRF modules by using the respective second RF interfaces, and thereby theRF modules convert the received RF signals into the first basebanddigital signals and send the first baseband digital signals to thebaseband processing unit; and wherein remaining receivers of the firstfrequency band and remaining receivers of the second frequency band areconfigured to convert the respective received RF signals into the secondbaseband digital signals, and send the second baseband digital signalsto the corresponding RF modules by using a digital baseband interface,and thereby the RF modules send the second baseband digital signals tothe baseband processing unit; and wherein multiple receivers of thethird frequency band are configured to convert RF signals received bysuch receivers into the second baseband digital signals, and send thesecond baseband digital signals to the third RF module by using adigital baseband interface, and thereby the third RF module sends thesecond baseband digital signals to the baseband processing unit.
 35. Thesystem according to claim 30, further comprising the baseband processingunit, wherein the RF unit comprises the first RF module, and the firstRF module corresponds to a first frequency band of the predeterminedfrequency band; wherein the first RF module is configured to receive afirst group of the RF signals of the first frequency band sent by themulti-frequency receiver, convert the first group of the RF signals ofthe first frequency band into the first baseband digital signals, andsend the first baseband digital signals to the baseband processing unit;and receive the second baseband digital signals that are obtained byconverting the remaining RF signals of the first frequency band and sentby the multi-frequency receiver by using a digital baseband interface,and send the second baseband digital signals to the baseband processingunit; and wherein the baseband processing unit is configured to receivethe first baseband digital signals and the second baseband digitalsignals sent by the first RF module, and perform baseband processing onthe first baseband digital signals and the second baseband digitalsignals.
 36. The system according to claim 35, wherein the RF unitfurther comprise: a second RF module, wherein the second RF modulecorresponds to a second frequency band of the predetermined frequencyband; wherein the second RF module is configured to receive a firstgroup of the RF signals of the second frequency band sent by themulti-frequency receiver, convert the first group of the RF signals ofthe second frequency band into the first baseband digital signals, andsend the first baseband digital signals to the baseband processing unit;and receive the second baseband digital signals that are obtained byconverting the remaining RF signals of the second frequency band andsent by the multi-frequency receiver by using a digital basebandinterface, and send the second baseband digital signals to the basebandprocessing unit; and wherein the baseband processing unit is configuredto receive the first baseband digital signals and the second basebanddigital signals sent by the second RF module, and perform the basebandprocessing on the first baseband digital signals and the second basebanddigital signals.
 37. The system according to claim 35, wherein the RFunit further comprises a third RF module, wherein the third RF modulecorresponds to a third frequency band of the predetermined frequencyband; wherein the third RF module is configured to receive the secondbaseband digital signals that are obtained by converting the RF signalsof the third frequency band and sent by the multi-frequency receiver byusing a digital baseband interface, and send the second baseband digitalsignals to the baseband processing unit; and to receive RF signals ofthe third frequency band from another antenna, convert the RF signals ofthe third frequency band from the antenna into third baseband digitalsignals, and send the third baseband digital signals to the basebandprocessing unit; and wherein the baseband processing unit is furtherconfigured to receive the second baseband digital signals and the thirdbaseband digital signals sent by the third RF module, and perform thebaseband processing on the second baseband digital signals and the thirdbaseband digital signals.
 38. The system according to claim 30, whereinthe digital baseband interface is a Common Public Radio Interface(CPRI).
 39. The system according to claim 30, wherein the basebandprocessing unit and the RF unit are separate functional modules.
 40. Thesystem according to claim 30, wherein the baseband processing unit isintegrated into the RF unit.